staging: dwc2: do not use IRQF_DISABLED

This flag is a deprecated NOOP, interrupt handlers are always run
with interupts disabled.

See commit 6932bf37 (genirq: Remove IRQF_DISABLED from core code), and
include/linux/interrupt.h:

	 * IRQF_DISABLED - keep irqs disabled when calling the action handler.
	 *                 DEPRECATED. This flag is a NOOP and scheduled to be removed
Signed-off-by: Matthijs Kooijman <matthijs@stdin.nl>
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dwc2/hcd.c

@@ -2920,7 +2920,7 @@ int dwc2_hcd_init(struct dwc2_hsotg *hsotg, int irq,
 	 * allocates the DMA buffer pool, registers the USB bus, requests the
 	 * IRQ line, and calls hcd_start method.
 	 */
-	retval = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_DISABLED);
+	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 	if (retval < 0)
 		goto error3;